Improvement in sewing-machines



E. BOUSCAY, Jr.

Sewing-Machine.

No. 127,145 7 Patented May 25 1372.v

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WITNESSES: INVENTOR;

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"PATENT FFIC E.

ELOI BoUscAY, JR., OF NQRWALK, 01110.

IMPROVEMENT IN Sl-IlllHNG-MACi-lINES.-

Specification formingpart of Letters Patent No. 127,145, dated May 28, 1872.

Specification describing certain Improvements in Sewing-Machines invented by ELOI BoUsoAY, Jr., of Norwalk, in the county of Huron, and State of Ohio.

My invention relates to that class of sewingin g machines which use only one thread, and make a stitch called single-threadlock-stitch; and the object of my invention is to simplify and make more certain the operation of the stitch-making device; and my invention consists, first, in uniting the two heretofore separate parts, known, respectively, as looper and looper-driver, and making them substantially one-and thesame piece; second, in securing the latch in an open position, when required, by means of a depression, either stationary or movable, acting on the upper portion of the latch projecting by the looper for that purpose.

Figure 1 is a plan view of a sewing-machine base embodying my improvements with needle and cloth-plates removed. Fig. 2 is a detail side view of a sewing-machine shuttlerace, containing my looper in its forward portion and in the act of forming a stitch. Fig. 3 is a similar view, with the looper in a position to take a loop from the needle. Fig. 4. is a detail side view of a feeding-bar, showin g the pin which raises the latch-opener when required. Fig. 5 is a plan view of my latchopener as at present used. Fig. 6 is a diagram, illustrating the single thread-woven or lock-stitch as made by my improved looper.

A is a sewing-machine base; B, the recess for needle-plate. G is the latch-opener. a is the feed-bar; b, in dotted lines, is a pin, projecting out of the side of the feed-bar and under the latch-opener, by means of which the feed in its upward movement, preparatory to feeding the fabric along, raises the latch-opener out of contact with the looper when moving backward, and while the first loop slides on the bar 0 toward the point of the looper D and over the latch e, and allows the thread to draw thelatch open without any obstruction as in Fig. 3, in which 0 is the latch-opener raised, and D the looper, about to take a loop from the needle. When the looper enters the loop ofneedle-thread the feed-bar drops, and with it the latch-opener (l, which is, in itself, a spring, fastened to the base A at the bottom of the needle-plate recess B on a plane level with the top of the looper, and the opener comes in contact with the upper portion of the latch e projecting above the looper D, opens the former, and holds it in Figs. 2 and 3. It is composed of a'bar, c, and

base, 2, united at the left, and forming a point, d, similar to a common shuttle-point. The bar 0 is provided with a hook, f, and latch, e, which is closed over the hook by the loops passing off from the bar 0. The end of said latch e opposite that which comes in contact with the hook f is made in the shape of a cam projecting sufficiently through the bar 0 of I looper 1) to come in contact with latch-open er 0 as the former passes by the latter. This causes the latch e to open and remain so until the loop has been drawn up back of the looper into the hook f, as heretofore described. The spring h between the bar 0 and base 2 has for its object to prevent accidental long loops passing oft from the bar from missing the latch, and the guard 41 at the rear of base 2 is to prevent the thread from drawing up suddenly against the bar 0 and opening latch e and hold the latter in such a manner as to break the thread.

The latch-opener may be either movable or stationary, as I have used a stationary projection with entire success. Neither do I confine myself to the particular shape of the latch, nor direction in which it opens, as it can open at the side of the bar 0 and embody the same principle.

Having thus described my invention, I do not claim broadly the mechanism to produce er, with a projection operating to open such the peculiar stitch herein mentioned; but-- latch, as described.

I claim as my invention 3. The movable latch-opener, combined with 1. Alooper, D, composed of two rigidly-conthe looper, and operated by the feeding-denccted. parts, 0 and 2, the former being provice, as and for the purpose set forth.

vided with a hook, and constructed and oper- ELOI BOUSGAY, JR. ating substantially as described. Witnesses:

2. The combination of the latch e, with its FRANK BAKER, heel projecting through the bar a of the loop- PETER GRAY. 

